COMPARATIVE ANAT03IY OF THE CÜCUKBITACE^. 29 



tlie ridges raised on both sides of the groove (PL I. Fig. 12-18). 

 The number of the fil)ro-vascuhir bundles varies from five to 

 thirteen. Aclinostemma racemo8iun, Jleloihria japoniea and. Gym- 

 nostemma cissoides have five bundles ; Schizopepon bryonicefolius, 

 var. japonicus, seven ; Jlomordica Cliaraiitia,^^ Cihmllus vulgarisy^^ 

 Cucumis saiivus, C. JTelo,^^ Lagenaria vulgaris, Trichosanthes 

 cuGumeroidcs, T. japoniea and T. multiloba, nine; Luffa cylin- 

 drica, L. acutangula and. Benincasa cerifcra, eleven ; Cucurbila 

 Pepo, thirteen. 



CHAPTEE V. 



THE COTYLEDON. 



The cotyledons are above the ground or underneath it. 

 Those of TrichosaniJics cucurneroidcs, T, japoniea, T. vndliloba, 

 and Gymnoslcmni.a cissoides, are entirely buried in the soil. The 

 anatomical structure of the cotyledons differs from that of the 

 foliage-leaves. 



Epidermis. When observed in a surface view the contour 

 of the epidermal cells of the cotyledons is either straight or 

 wavy as in the case of the foliage-leaves. On the upper surface 



1) H. A. LoTAK. loc. clt. p. 103. 



2) Ditto, p. 95. 

 o) Ditto, p. 96. 



